Formalizing the interference temperature model

TL;DR: Two interpretations of the ITM are developed and for each, tradeoffs between power, bandwidth, and capacity are examined, and algorithms for computing RF transmission parameters are developed that seek to maximize both capacity and spectral efficiency for a given RF environment.

Abstract: To combat recent spectral overcrowding in unlicensed bands, the FCC has been investigating new ways to manage RF resources. The idea is to let people use licensed frequencies, provided they can guarantee interference perceived by the primary license holders will be minimal. With advances in software and cognitive radio, practical ways of doing this are on the horizon. In 2003, the FCC released a memorandum seeking comment on the interference temperature model (ITM) for controlling spectrum use. Formally defining and analyzing techniques for implementing this model are the primary goals of this paper. Two interpretations of the ITM are developed and for each, we examine tradeoffs between power, bandwidth, and capacity. From these relationships, algorithms for computing RF transmission parameters are developed. These algorithms seek to maximize both capacity and spectral efficiency for a given RF environment. Additionally, we describe ways to choose a center frequency that will optimize future performance, subject to the constraints of the ITM. Copyright © 2007 John Wiley & Sons, Ltd. The opinions expressed in this document represent those of the author, and should not be considered an official opinion or endorsement by the Department of Defense or US Federal Government.